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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2012
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment, including equipment acquired under capital lease obligations, are summarized as follows as of December 31, 2012 and 2011:
(in thousands) | Estimated useful life (in years) |  | 2012 |  | 2011
Land | — |  |  | $ | 15,907 |  |  | $ | 15,686 |
Buildings and improvements | 2-40 |  |  | 283,173 |  |  | 275,529 |
Machinery and equipment | 3-20 |  |  | 206,871 |  |  | 176,662 |
Computer software | 1-10 |  |  | 86,280 |  |  | 65,344 |
Furniture and office equipment | 1-13 |  |  | 80,343 |  |  | 76,809 |
Construction in progress | — |  |  | 79,402 |  |  | 51,827 |
|  |  | 751,976 |  |  | 661,857 |
Less: Accumulated depreciation and amortization |  |  | (333,044 | ) |  | (290,065 | )
Property, plant and equipment, net |  |  | $ | 418,932 |  |  | $ | 371,792 |
Amortization of assets acquired under capital lease obligations is included within accumulated depreciation and amortization above for the years ended December 31, 2012 and 2011, respectively. For the years ended December 31, 2012, 2011 and 2010 depreciation and amortization expense totaled $64.8 million, $57.0 million and $47.9 million, respectively. For the years ended December 31, 2012, 2011 and 2010 amortization expense related to computer software costs totaled the $8.2 million, $7.5 million and $4.6 million, respectively. Repairs and maintenance expense was $13.7 million, $12.9 million and $11.8 million in 2012, 2011 and 2010, respectively. For the year ended December 31, 2012 and 2011, construction in progress includes amounts relate d to ongoing software development projects and the construction of new facilities in the United States. For the years ended December 31, 2012, 2011 and 2010, interest capitalized in connection with construction projects was not significant.

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- Definition The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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